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Left 4 Dead Mod Tools Released

The software development kit for Valve's zombie shooter Left 4 Dead were released to open beta today.

The SDK mod tools are now freely available to all owners of the game through Steam.
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Valve has also released SketchUp Source tools, which allows modders to create content for the Source engine using Google SketchUp.

The full list of kit features follows:

Updated Hammer, the Source level editor

Suite of command line compiling utilities, such as studiomdl and map compiling tools